#region License
// Copyright 2008-2009 Jeremy Skinner (http://www.jeremyskinner.co.uk)
// 
// Licensed under the Apache License, Version 2.0 (the "License"); 
// you may not use this file except in compliance with the License. 
// You may obtain a copy of the License at 
// 
// http://www.apache.org/licenses/LICENSE-2.0 
// 
// Unless required by applicable law or agreed to in writing, software 
// distributed under the License is distributed on an "AS IS" BASIS, 
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
// See the License for the specific language governing permissions and 
// limitations under the License.
// 
// The latest version of this file can be found at http://www.codeplex.com/FluentValidation
#endregion

namespace FluentValidation.Validators {
    using System;
    using Attributes;
    using Internal;
    using Resources;
    using Results;

    [ValidationMessage(Key = DefaultResourceManager.LengthValidatorError)]
    public class LengthValidator<TInstance> : IPropertyValidator<TInstance, string>, ILengthValidator {
        public LengthValidator(int min, int max) {
            Max = max;
            Min = min;

            if (max < min) {
                throw new ArgumentOutOfRangeException("max", "To should be larger than min.");
            }
        }

        #region ILengthValidator Members
        public int Min { get; private set; }
        public int Max { get; private set; }
        #endregion

        #region IPropertyValidator<TInstance,string> Members
        public PropertyValidatorResult Validate(PropertyValidatorContext<TInstance, string> context) {
            int length = context.PropertyValue == null ? 0 : context.PropertyValue.Length;

            if (length < Min || length > Max) {
                MessageFormatter formatter = new MessageFormatter()
                    .AppendProperyName(context.PropertyDescription)
                    .AppendArgument("MinLength", Min)
                    .AppendArgument("MaxLength", Max)
                    .AppendArgument("TotalLength", length);

                string error = context.GetFormattedErrorMessage(GetType(), formatter);

                return PropertyValidatorResult.Failure(error);
            }

            return PropertyValidatorResult.Success();
        }
        #endregion
    }

    [ValidationMessage(Key = DefaultResourceManager.ExactLengthValidatorError)]
    public class ExactLengthValidator<TInstance> : LengthValidator<TInstance> {
        public ExactLengthValidator(int length) : base(length, length) {
        }
    }

    public interface ILengthValidator : IPropertyValidator {
        int Min { get; }
        int Max { get; }
    }
}